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Xerces-C++ Library Attribute Parsing Denial Of Service
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SUMMARY
<http://xml.apache.org/> Xerces (named after the Xerces Blue butterfly)
provides world-class XML parsing and generation. Fully-validating parsers
are available for both Java and C++, implementing the W3C XML and DOM
(Level 1 and 2) standards, as well as the de facto SAX (version 2)
standard. The parsers are highly modular and configurable. Initial support
for XML Schema (draft W3C standard) is also provided.
A parsing problem has been found in the Xerces C++ library when handling a
specially crafted XML document. The bug will cause the parses to consume
all available CPU resources and effectively cause a denial of service.
DETAILS
Vulnerable Systems:
* Xerces-C++ library version 2.5.0
Immune Systems:
* Xerces-C++ library version 2.6.0
An attacker can craft a malicious XML document, which uses XML attributes
in a way that inflicts a denial of service condition on the target
machine. The result of this attack is that the XML parser consumes all the
CPU resources for a long period of time (from seconds to minutes,
depending on the size of the payload).
In order to obtain a DoS for several minutes payloads should be about a
few hundred KBs in magnitude.
Vendor Status:
The developers at the Apache XML project have been contacted and a new
version containing a fix is available. Upgrade to version 2.6.0.
ADDITIONAL INFORMATION
The information has been provided by <mailto:aksecurity@hotpop.com> Amit
Klein (AKsecurity).
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